Validation through a binary key code and a polarization sensitive digital technique

Abstract

We implement a validation technique, using a polarization-encoding architecture based on digital speckle correlation and a binary key code. A validation mark is thus generated which can be affixed on a document or included on an optical chip or magnetic tape in any card. Security is duplicated by the speckle and polarization characteristics of the procedure. Both encoded mark and decoding binary key are stored digitally. The original input can be retrieved for authentication by a subtraction operation performed with conventional software. No additional experimental setups are required in the decoding step. Experimental results are presented to demonstrate the method.